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As of now, only certain coin shops act as an assaying service, and thats likely due to being on a first name basis with them. A while back i sold a bar of silver to a bro who was getting into stacking and we verified it at the lcs, generally though an assaying would likely be for a larger sum of wealth as a notary's work is usually reserved for.
Accreditation could be as simple as a course with a standard catalog of tools available
